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I've built one for my mig when I wanted to run it over gravel. All I did was make an angle iron frame for the the bed. Then I made two pivoting axles, think of two front ends on a wagon. On one I attached the tongue. Then I attached a rod diagonally between the front and rear axles.

The great thing about four wheel steer is you don't have to allow for tail swing or tail cut when making a corner. Properly made your wagon's rear wheel will follow in the exact path of the front one when making a turn.

The downside of the one I built is when making a sharp turn the wagon can tip over if top heavy. But it was simple and easy to make so I did it that way knowing I had issues with tip over under some circumstances.

Now if you're handy and can make your axles with king pins and tie rods, as on a go kart, golf cart, automobile, you can have a four wheel steer wagon that trails tricker'n than anything without the tip over issues.

Don't know If you are talking about one of these
Tractor supply garden dump cart, was thinking of what can be done for other uses with the style of frame steering. I have no use for an off road/gravel welding cart. But it could work if the center of gravity is lowered.
All the bits and pieces laid out, I did a review of that style for another site. the steering part is upper right side in this photo the draw bar is attached by pivot to the center of the control arm to each wheel. As this cart can be used to tow behind a lawn/garden tractor. The handle can be turned around for a hitch pins trailer hitch
This is the front section of the frame,Steering assembly before being attached

If you are looking for what the steering looks like I can go out and snap a few pic's but right now it is filled with Fruit wood being transferred form its former home to its new short life as fuel for the son's smoker

This is the small version carries less than the 1,000 pound version, the garden flat top carts at the garden centers around here all have the same type of steering set up.

Originally Posted by Bob Miller

If you are talking about the Acrman theory. The inside tire has a smaller radius.
I hope I spelled his name right.

Intense!

I love these posts/subjects that challenge all your engineering and welding skills. If I recall, thinking back to my erector set days, screw 'A' goes into slot 'J' and tighten gently. Don't overtighten this bolt as it will have to be removed and another support placed on the screw at a later time.

Be sure to have sufficient air in your tires. Never leave your wagon behind your father's car. (...how many times have I told you to put your toys away when your done with them.)

My neighbor wanted to use mine but I said No________way. He bought the yellow one Friday; he was moving block Saturday for his wall and the front wheel hub blew out and the whole thing collapsed, way too funny, he threw a tantrum. So I thought about beefing up mine befor it happens to me .

I've got a different version of that same cart bought about7 years ago.......I don't think realistically you should have a problem with it.......I was using it haul logs from a gigantic tree we cut downmore than a 1000lbs at a time......thank god for ratchet straps.....and using my rider to haul it around.........never a problem with it........still have it lengthened to 8 foot long now.its my party tent permanent hauler......definitely one of the better purchases I've made.Jim